MC 54 250B with 244c engine 2008 build fuel pump. By bobf (Read 577 times)

[bobf]

I have taken it out so I could replace it. Ordered one for about $18. Mounting holes were at 3" on centers. I need something bigger at about 3-1/4" centers. I have found one but their price is $34. I also found one on the Rocketa part list but they have kindly reduced the price from $112 down to $64, I think. So many on the web for $7 to $15 but they all have 3" centers on the mounting holes.

Any one know of a good fuel pump with the 3-1/4" (approx) centerline to centerline mounting holes with the ability to pump for the 244cc engine and not cost so much.

Right now I have put my old pump back in and it just does not want to start at all. Prior to taking it out it would start but never ran well at all and kept changing speeds while idling. From 1500 to 3000 to less than a 1000 to 2000 then suddenly slow to a stop.

I was able to get it to start at about 3/4 throttle but now the engine just smokes a lot, so I shut down.

[bobf]

OK, since last posting, I have put on a new fuel pump that looks much like my original one. Still won't start so I thought maybe because it is needing priming to get the engine going and then there will be enough vacuum to get the gas pumped.

Sorry, even with the priming cup attached to the fuel inlet on the carb, the engine will not even fire.

Next desperation has been to follow the setup and checking guidelines in the older Honda manual for their 250cc scooters. They had the same engine as Jonway 250cc scooters. Much has checked out real well. Two connections I have not found yet need checked, they come from the spark timing stuff. I did find one item that did not meet the specs so bought one. It just arrived in the mail. Does not look at all like the one on the scoot or in their catalog. My coil and cable is black. This one is bright orange so not sure if it is proper. Will try it Saturday and if it works, I am happy. If it does not work it was only $2.50 so no big loss.

Will let you folks know if it is successful or not. Others I saw were selling for about $12 or more.

[bobf]

Now today I was able to install my new spark plug cable and test the coil and spark. Today, with old or new, not one spark. This seems to be a progressively worse electrical problem. So one more cover needs to come off so I can see behind the panel at the wiring and check for problems their. I thought I had done that last summer but maybe missed something so this week end will take the front panel loose enough for me to see behind the panel.

The Honda book say it could be: For weak or no spark
Faulty spark plug. Cleaned
Fouled spark plug. Cleaned
Faulty Ignition Control Module (ICM) Replaced
Broken or shorted spark plug Will check again.
Broken or shorted Ignition coil Replaced
Faulty ignitions Switch After front cover removed
Faulty engine stop switch After front cover removed

Why is this such a progressive thing? Maybe after I get the front cover off I will find out more.

[bobf]

I NEED HELP!!! What is the proper way to connect the water and vacuum hoses to the Carb and Air ducts and Engine.

I seem to have something messed up as I get water out of the vacuum hose connection on the back of the carb, near engine. Not sure about the connections on the right side of the carb either. Been looking around in the web and only find the carbs ready to sell and no pictures of the carb connected from both sides, or even one side.

Any and all help would be appreciated.

[bobf]

Finally have been able to get engine to start running. Had to do it with partial throttle advance and it will not allow to idle. Just runs at a faster than idle rate or nothing. It is also making black smoke as it runs and at times it will belch and bark, back firing for some.

Not sure where this will lead. Could timing be a problem or another valve adjustment?

Still wondering why I get coolant in my vacuum lines.

These problems work for both the carburetors I have had on this engine. So I wonder if it has anything to do with the carburetors at all.

Any and all ideas will be looked at. Tired of working on my scoot, would rather ride than fix.

All this is done without the air tube installed. Is that a critical thing? When air tube was installed I wasn't doing any better. Just occasional backfiring or short sounding like it would like to start but could not.

[bobf]

OK, I tried to readjust the valves a bit.

I loosened the rear valve adjuster and was able to move it front or rear with ease. I moved it a notch to the rear.

I then loosened the front adjuster but was not able to move it front or rear easily. I had to use heavy pliers to grab the adjuster and pulled hard to move to the front or rear. It seems to be jammed for some reason.

This could be the reason for my running problems. If I can not adjust the valves, what is the problem? Time to do a valve job? Or just buy a valve section for the engine and do a top down tear down and replacement of the valve section?

DO NOT READ ABOVE - IT IS WRONG.

Today I tried to restart and then recheck the valves again. No problem with either valve adjustment so I now believe the tightness was due to the pressure of the valve spring against the adjusting mechanism. So again I have been mislead by circumstances. Back to wondering why the engine only runs poorly, if at all. I have tried two carburetors with the same results, lousy.